@book{3248,
	author = {Purcell, Edwin J. and Varberg, Dale},
	title = {Cálculo},
	publisher = {Pearson Educación},
	year = {2007},
	address = {México :},
	edition = {9a. ed.},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/L126089.jpg}
}